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By LZH | 11 August 2023 | 0 Comments

The preparation of an Mg–Al–B alloy using high-temperature sintering

What is Aluminium magnesium boride?
The influence of the sintering temperature on the synthesis reaction of Mg0.5Al0.5B2 is very important. An extremely low temperature is not conducive to the reaction. With the increase of sintering temperature, the content of the Mg0.5Al0.5B2 phase gradually increases, and the phase content of residual metal gradually decreases. On the other hand, increasing the sintering temperature will increase the product's particle size, which is not beneficial for its application. The phase and morphology analyses showed that the optimum sintering temperature is 1000 °C. Holding time has little effect on the synthesis reaction. When the sintering temperature is insufficient, prolonging the holding time cannot promote the sintering reaction progress but also lead to the secondary recrystallization of grains. According to the phase analysis, Mg0.5Al0.5B2 alloy can be prepared by sintering at 1000 °C with a holding time of 0.5 h. In the Mg0.5Al0.5B2 alloy synthesized by high-temperature sintering under an inert atmosphere, there is no reaction among the elements, and the metal in the alloy exists in the form of a simple substance. In the following research, we will use a synchronous thermal analyzer, infrared thermometer, and high-speed camera to study the combustion performance of the prepared materials and compare them with the combustion performance of boron.

The preparation of an Mg–Al–B (Mg0.5Al0.5B2) alloy using high-temperature sintering
The preparation of an Mg–Al–B (Mg0.5Al0.5B2) alloy using high-temperature sintering mainly includes three stages: the pre-sintering stage, the heating and sintering stage, and the high-temperature holding stage. In the pre-sintering stage, metal adsorption gas and water are volatilized. Mutual attraction exists between atoms in the solid state, and heating enables the atoms to obtain enough energy to migrate and fill the gaps between the particles. We chose 600 °C for pre-sintering because it is lower than the melting point of magnesium and aluminum, and at the same time, the higher temperature is conducive to thermal movement. Heating enables the atoms to obtain enough energy to migrate. The gaps between the particles will be reduced. Therefore, the mixed powders are more tightly combined by internal thermal movement, and then the temperature is raised higher and kept for a certain time. The magnesium and aluminum are melted, but the boron is not melted. This process is not sintering in the true sense but a combination of sintering and melting processes. Recrystallization begins at the heating and sintering stages. Deformed grains are recovered in the particles and reorganized into new grains, and the oxides on the surface are reduced. Furthermore, sintering necks are formed at the particle interface. Complete sintering occurs at the high-temperature holding stage. Diffusion and flow fully occur in this stage and near completion, forming many closed pores, which continue to decrease in size and number. The density of the sintered body significantly increases. The holding time should not be too short as this is unsuitable for increasing the density. During the heating process, the liquid phase viscosity of the sample will decrease. Properly extending the holding time can strengthen this effect and promote the diffusion of atoms and vacancies. This will promote the particle rearrangement and viscous flow process, and the gaps will continue to decrease. Therefore, theoretically, appropriately increasing the holding time can increase the density of the sample. However, in the later sintering stage, the holding time minimizes the progress of the solid-phase synthesis of Mg0.5Al0.5B2.

The XPS analysis of Mg0.5Al0.5B2 alloy powder
Sintered at 1000 °C for two h and ground. The XPS peak of Mg 1s at 1303.0 EV in Figure 6b indicates that Mg is 0 valent, and the XPS peak of B 1s at 187.4 EV in Figure 6c indicates that boron is 0 valent. Al in the alloy is also 0 valent according to the charge conservation. This shows that the crystal Mg0.5Al0.5B2 alloy synthesized by high-temperature sintering is not an intermetallic compound. There is no reaction between the elements, and the metal in the alloy exists in the form of a simple substance. Unreasonably prolonging the holding time can sometimes exacerbate the secondary recrystallization effect, which leads to abnormal grain growth. A very long holding time is ineffective when the sintering temperature is not sufficiently high. Furthermore, it will result in particle growth, which is not beneficial to the application of the alloy. As in ignition and combustion, the fuel must be in full contact with the oxidant or oxygen. If the particle size of the sample is larger, the surface area of the particles will become smaller. This will result in less oxidant or oxygen in contact with the particles. The more fully the sample is in contact with oxygen, the more violent the oxidation reaction will occur; the more heat and energy released, the faster the burning rate will be. The easier the sample will be ignited.

Price of Aluminium magnesium boride
Aluminium magnesium boride particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Aluminium magnesium boride. A large amount of large amount will be lower. The Price of Aluminium magnesium boride is on our company's official website.

Aluminium magnesium boride supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Aluminium magnesium boride, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Aluminium magnesium boride, you are welcome to contact us or inquire at any time.

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